Maintenance
6-6 2715 Spectrum Analyzer Service Manual
Performance Checks and Recalibration. The instrument performance should be
checked after each 2000 hours of operation or every 12 months, if the instrument
is used intermittently,to ensure maximum performance and assist in locating
defects that may not be apparentduring regular operation. Instructions for
conducting a performancecheck are provided in Section 4: Performance
Verificationof this manual.
Stored Data in Nonvolatile Memory.Data stored in nonvolatile memory will be lost
if backup battery powerto the memory is interrupted, such as when changing the
battery.
TroubleshootingThe Spectrum Analyzer containsfirmware that will troubleshoot the frequency
control system. After a defective assemblyor component is located, refer to
Removing and Replacing Assemblies and Subassemblieson P age6--17 for
removal and replacement instruction s.
The following aids are providedto assist in troubleshooting:
Diagrams. Functional block and circuit diagrams, on foldoutpages in the
Diagrams section, contain significantwaveforms, voltages, and logic data
information. Conditions for getting the data are provided on the diagram or
adjacent to it. Refer to the Replaceable Electrical Parts list for a description of
all assemblies and components.
Replaceable Electrical Parts. This list indicates changes to components with serial
numbers showing the first serialnumber when usage of the part occurred and the
last serial number when usageof the part stopped. Absence of serial numbers
indicates the parts were in use since the first instrumentshipped. When a major
modification is made to an assemblyor board and it is no longer compatible with
earlier instruments, a new part number i s assigned and a separate schematic with
associated illustrations is added. All diagramsindicate the new part number and
the instrument serial number break. If the assemblyis compatible with earlier
instruments and the change is significant enough to require a separateschematic,
this will also be identified.
Circuit Board Illustrations and Component Locator Charts. Electricalcomponents,
connectors, and test points areidentified on circuit board illustrations that are
located on the inside fold of thecorresponding circuit diagram or the back of the
preceding diagram. A grid on the circuit b oard illustrationand the circuit
schematic, plus a look up table, provide the means to quickly locate components
on either the diagram or the circuit board.